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Texas Instruments LMP8640MKE-H/NOPB
- Part No.:
- LMP8640MKE-H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MKE-H/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,701
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Product details
Overview
LMP8640MKE-H/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 100 V/V gain, designed to accurately amplify small differential voltages across shunt resistors in the presence of high common-mode voltages up to 42 V. It operates from a 2.7 V to 12 V single supply, delivers ±0.25% max gain error over temperature, and features 900 µV typical input offset voltage - enabling accurate DC/AC current monitoring in battery-powered industrial power supplies.
For engineers reviewing the LMP8640MKE-H/NOPB datasheet, LMP8640MKE-H/NOPB pinout, LMP8640MKE-H/NOPB application, or LMP8640MKE-H/NOPB equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for high-reliability current sensing designs requiring stable gain, low drift, and wide common-mode range.
Technical Context
The LMP8640MKE-H/NOPB implements a precision instrumentation amplifier topology with internal matched RIN (5 kΩ) resistors and RG = 2×RIN feedback configuration, delivering fixed 100 V/V gain without external components. Its input stage supports common-mode voltages from –2 V to +42 V while rejecting interference via 103 dB CMRR (2.1 V–42 V) and 85 dB PSRR.
It uses a buffered rail-to-rail output stage with 40 mV minimum and 11.85 V maximum output swing at 12 V supply, enabling direct interface with 12-bit ADCs. The device achieves 230 kHz bandwidth and 1.8 V/µs slew rate under 12 V operation, optimized for fast transient response in motor control and battery protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100 V/V - eliminates external gain-setting resistor errors and layout sensitivity. |
| Common-Mode Range | –2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 36 V DC systems including automotive battery monitoring. |
| Max Gain Error | ±0.25% at 25°C - ensures <1 mV absolute error on 10 mV sense voltage, critical for precision power budgeting. |
| Input Offset Voltage | 900 µV typical - enables accurate sub-100 mA current measurement with 10 mΩ shunt at 25°C. |
| Supply Voltage Range | 2.7 V to 12 V - compatible with Li-ion, lead-acid, and industrial 3.3 V/5 V logic rails without level-shifting. |
| Bandwidth | 230 kHz - sufficient for PWM-based motor current sampling up to 20 kHz switching frequencies. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and industrial ambient environments without derating. |
Pinout & Package
Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Amplified output | Buffered voltage output referenced to V−; drives 1 MΩ load with ≤30 pF capacitance. |
| 2 - V− | Negative supply | Ground reference for output stage; must be connected to system ground or negative rail. |
| 3 - +IN | Positive input | High-impedance node connected to shunt resistor high side; accepts common-mode up to +42 V. |
| 4 - −IN | Negative input | High-impedance node connected to shunt resistor low side; rejects common-mode via matched RIN network. |
| 5 - NC | No connect | Internally unconnected; must remain floating - no PCB trace or thermal pad connection. |
| 6 - V+ | Positive supply | Single-supply input (2.7–12 V); powers internal amplifier and output buffer. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 100 V/V gain | Eliminates external resistor tolerance and thermal drift errors - guarantees gain accuracy without calibration. |
| 103 dB CMRR (2.1 V–42 V) | Rejects noise from high-voltage bus transients, enabling clean current measurement in noisy 24 V industrial PLCs. |
| 900 µV input offset | Supports 10 mΩ shunt-based 100 mA full-scale sensing with <1% total error at room temperature. |
| 230 kHz bandwidth | Accurately captures current ripple in 48 V telecom rectifiers and BLDC motor phase currents up to 20 kHz. |
| –40°C to +125°C operation | Validated performance across full industrial temperature range - no derating required for embedded power modules. |
Applications
| Industrial Power Supply Monitoring | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Real-time current monitoring in 24 V programmable logic controller (PLC) power rails to detect overcurrent faults before fuse activation. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to scaled analog output for microcontroller ADC sampling. Use Value: Enables <100 µs fault detection latency using 230 kHz bandwidth and 1.8 V/µs slew rate - faster than discrete op-amp solutions. |
Use Scenario: Cell-level current measurement in 48 V lithium-ion battery packs for state-of-charge (SoC) estimation and charge balancing control. IC Role / Device Role / Timing Role: Precision current sensor interfacing between shunt resistor and isolated ADC in battery monitor IC. Use Value: ±0.25% gain error and 2.6 µV/°C offset drift ensure SoC accuracy remains within ±2% over full temperature range. |
| Motor Control Current Feedback | Automotive Body Control Module (BCM) |
|
Use Scenario: Phase current sensing in 3-phase BLDC motor drives for field-oriented control (FOC) algorithms in HVAC compressors. IC Role / Device Role / Timing Role: High-bandwidth current amplifier feeding analog inputs of motor control MCU with minimal signal conditioning. Use Value: 230 kHz bandwidth supports accurate current reconstruction at 20 kHz PWM carrier frequency with <1° phase error. |
Use Scenario: Load current monitoring for smart fusing in 12 V vehicle body control modules, replacing electromechanical relays. IC Role / Device Role / Timing Role: High-side current sensor detecting short-circuit events and reporting to CAN-connected ECU. Use Value: –2 V to +42 V common-mode range accommodates cold-crank (–2 V) and load-dump (42 V) transients without saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | 20 V/V fixed gain, 80 V common-mode range, 120 kHz bandwidth, ±0.2% gain error | Lower gain requires larger shunt voltage; better suited for higher-current, lower-precision applications | Select when >42 V bus voltage or tighter gain tolerance is required, but 100 V/V scaling is not needed |
| MAX40056ATA+T | 100 V/V fixed gain, 65 V common-mode range, 400 kHz bandwidth, ±0.5% gain error | Higher bandwidth and wider common-mode, but looser gain accuracy and higher quiescent current (1.1 mA vs. 1.05 mA) | Select when >42 V operation (e.g., 48 V server PSUs) and faster transient response are prioritized over gain precision |
Compared with LMP8640MKE-H/NOPB, INA240A1IDR offers superior common-mode range and gain accuracy but requires redesign of shunt sizing due to 20× gain; MAX40056ATA+T extends voltage capability and speed at the cost of gain stability and thermal drift performance in industrial temperature cycling.
Availability
LMP8640MKE-H/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, motor control feedback loops, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LMP8640MKE-H/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and power management ICs.
The LMP8640 family was engineered specifically for high-accuracy, high-common-mode current sensing in industrial, automotive, and computing power systems - emphasizing gain stability, low offset drift, and robust EMC performance.
FAQ
What is the exact gain setting of the LMP8640MKE-H/NOPB?
The LMP8640MKE-H/NOPB has a factory-trimmed fixed gain of exactly 100 V/V. This value is laser-trimmed during production and specified with ±0.25% maximum error at 25°C and ±0.51% over –40°C to +125°C - eliminating need for external gain resistors or post-assembly calibration.
Can the LMP8640MKE-H/NOPB operate with a 3.3 V supply?
Yes, the LMP8640MKE-H/NOPB supports supply voltages from 2.7 V to 12 V. At 3.3 V, it maintains full functionality with 40 mV minimum output voltage and 3.25 V maximum output swing (VCM = 2.1 V), enabling direct interface with 3.3 V ADCs without level-shifting circuitry.
Does the LMP8640MKE-H/NOPB require external compensation components?
No, the LMP8640MKE-H/NOPB is internally compensated and stable with capacitive loads up to 30 pF. External compensation is unnecessary - the device delivers 230 kHz bandwidth and 1.8 V/µs slew rate at 12 V supply without added RC networks or feedback capacitors.
What is the function of Pin 5 (NC) on the LMP8640MKE-H/NOPB?
Pin 5 is Not Connected (NC) - it is internally unconnected and must remain electrically floating on the PCB. No trace, thermal pad, or grounding should be attached to this pin, as doing so may compromise ESD robustness or cause unpredictable bias shifts in the input stage.
How does the LMP8640MKE-H/NOPB handle negative common-mode voltages?
The LMP8640MKE-H/NOPB supports common-mode voltages down to –2 V, allowing operation during automotive cold-crank conditions where battery voltage dips below ground reference. Input stage remains functional and linear across the full –2 V to +42 V range without saturation or phase reversal.
LMP8640MKE-H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.8V/µs
- Gain Bandwidth Product:
- 230 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 2.3mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMP8640MKE-H/NOPB FAQ
1.How can I place an order for LMP8640MKE-H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MKE-H/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMP8640MKE-H/NOPB reliable?
The price and inventory of LMP8640MKE-H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8640MKE-H/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MKE-H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MKE-H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MKE-H/NOPB?
LMP8640MKE-H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MKE-H/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMP8640MKE-H/NOPB?
For technical support, including LMP8640MKE-H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MKE-H/NOPB requirements.
6.How does Aetrix verify that LMP8640MKE-H/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MKE-H/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMP8640MKE-H/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MKE-H/NOPB?
All LMP8640MKE-H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MKE-H/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMP8640MKE-H/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MKE-H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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